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How to look at the operating mechanism of a centralized box gantry crane

by:Powerston     2021-04-02
The operating mechanism of the centralized box construction hoist can see the wheel deviation, the wheel inspection on the same balance beam, and the track appearance inspection. The operating mechanism of the centralized box gantry crane can see the wheel deviation, the wheel inspection on the same balance beam, and the track appearance inspection. ① Track visual inspection ② Longitudinal inclination ③ Gauge deviation ④ Relative height difference between two tracks (4) Rail clamp maintenance (5) Crane span deviation measured by wheels (6) Diagonal deviation measured by wheels ( 1) The horizontal and vertical deviations of the wheels of large vehicles are the same as those of small wheels (2) The symmetry planes of the two wheels on the same balance beam should be in the same vertical plane, and the allowable deviation should not be greater than 1mm. (3) Including appearance and inclination, Technical standards for gauges, etc. ①The track should not have cracks, rail tops, and the side of the track head should not exceed 3mm. ②The longitudinal inclination of the crane track should not be greater than 5/1000. ③The value is less than or equal to 10mm. The relative elevation deviation of the root track is less than or equal to 10mm (4) If the jaw wear exceeds 40% of the original thickness, it should be replaced. The electric rail clamp should always pay attention to adjusting the safety ruler so that the pointer is at the specified position. (5) When the span is less than or equal to 30m, The span deviation should not be greater than 5mm, when L>30m, the span deviation should not be greater than 8mm (6) When the span ≤30m, the deviation should not be greater than 5mm, when L<30m, the deviation should not be greater than 10mm 1 Main beam geometry (1) Main beam upper camber inspection (2) Main beam lower deflection test (3) Horizontal side bend inspection (4) Web wavy deformation (1) Mid-span camber is L/1000, and the allowable deviation is upper camber (2) Full-load mid-span elastic deflection ≤L/700, no-load mid-span deflection should not exceed 0.6/1000L. If the specified value is exceeded, it should be repaired and reinforced (3) The side of the mid-span level should not be greater than L/2000 (4) The wave crest in the compression zone should not be greater than 0.7δ, and the wave crest in the tension zone should not be greater than 1.2δ, δ-web thickness 2 Bridge assembly (1) Two diagonal inspections in the horizontal direction (2) Two diagonal inspections in the vertical direction (3) The deviation of the distance between the trolley track and the longitudinal center of the bridge (1) The allowable deviation of box girder is 5mm; the allowable deviation of pestle beam (2) Allowable deviation of 10mm (3) Allowable deviation of less than 3mm 3 Box frame (1) Inspection of cracks (2) Metal structure coating and corrosion protection (1) Metal structure should not have cracks and weld cracks ( 2) The painting should be kept intact to prevent corrosion. The amount of corrosion should not exceed 10% of the original thickness. Paint after repair. 4 Truss members The curvature of the main stress members between the truss nodes. The main stress members of the truss (compression bar) ) The bending should not exceed 1/1000, but the size should not be larger than 2mm 1-Calculated length of the bridge crane overhaul project and technical standard (electrical equipment part) serial number component overhaul project technical standard 1 motor (1) disassembly Turn on the motor, clean the bearings and change the lubricating oil, measure the insulation resistance of the stator and rotor (2) Overhaul of the motor shaft (3) Overhaul of the winding (4) Inspection of the fit gap between the end caps (5) The slip ring and the brush Maintenance (1) For the newly installed motor, the stator insulation resistance should be greater than 2MΩ, and the rotor insulation resistance should be greater than 0.8MΩ; for the motor in use, the stator insulation resistance should be greater than 0.5MΩ, and the rotor insulation resistance should be greater than 0.5MΩ; Standard, it should be disassembled and dried; under drying conditions (50~70), the stator insulation resistance should reach 1MΩ, and the rotor insulation resistance should be greater than 0.5MΩ. (2) After overhaul, the motor shaft must not be cracked, and the curvature must not exceed 0.2mm. The neck should meet the requirements of the drawing. (3) No damage to the winding is allowed to ensure that the paint is intact. When repairing, it is not allowed to scrub the winding with gasoline, oil, kerosene and other liquids. (4) The gap between the end cap and the stop is shown in the table (mm). The clearance of the bearing hole of the cover should not be greater than 0.05mm. The outer diameter of the stop of the end cover 300 500 800 1000 Large clearance 0.05 0.10 0.15 0.20 (5) The spring pressure of the brush holder should not be lower than 0.05~2.00NCM2, the pressure of all the brushes on a motor Should be consistent, the gap between the brush and the brush holder should not be greater than 0.2mm, the surface of the slip ring is not allowed to burn and deep grooves; the brush and the slip ring must be in good contact, and the ellipticity of the slip ring should not exceed 0.02~0.05m_ 2 The contactor (1) is disassembled and cleaned (2) the pressure is adjusted and the contact is overhauled.
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